|UXR (Ultra eXtra Refractive index glass)|
|XR (eXtra Refractive index glass)|
|Moulded Glass Aspherical|
High image quality in a compact, lightweight zoom
This cutting-edge design employs Tamron's advanced optical and mechanical design technology. There are 16 elements in 12 groups including three Moulded-Glass Aspherical elements, two LD (Low Dispersion) elements and UXR (Ultra-eXtra Refractive Index) glass. Together, they correct optical aberrations, while state-of-the-art multilayer coating significantly minimises ghosting and flare to deliver images of exceptional clarity. The entire package is kept incredibly compact through the use of advanced mechanical design engineering.
Far superior image quality – while reducing lens size and weight
Tamron uses several hybrid aspherical lens elements in its lenses bearing the Aspherical designation. The benefits are two-fold: first, their non-spherical shapes virtually eliminate spherical aberration and image distortion. Second, as one hybrid aspherical lens element can take the place of multiple elements without compromising performance, they allow the lens to be much more compact.
As a result, these innovative optics have played a crucial role in delivering uniformly high image quality across all apertures and focal lengths of extraordinarily compact ultra-zoom lenses.
Sharpens edges by reducing 'colour fringing'
Chromatic aberration occurs when a lens element refracts different wavelengths of a ray of light – its rainbow colours – at very slightly different angles. This results in the 'colour fringing' that reduces the sharpness of an image. LD elements are made from special glass materials with extremely low dispersion indices (i.e. the refraction of a ray of light into rainbow colours is extremely narrow). Thus they effectively compensate for chromatic aberration at the centre of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (toward the edges of the field) that often occurs at short (wideangle) focal lengths.
Although costly, LD glass materials result in clear, vivid image quality.
Extra Refractive Index
More compact lenses with superior image quality
XR (Extra Refractive Index) glass can bend light rays at steeper angles, thereby decreasing the physical length of the lens while enhancing imaging performance by minimising optical aberrations. With its superior light-bending power, XR glass makes it possible to design a short-barrel lens with the same light-gathering ability (aperture value) as a long-barrel lens – even with a smaller lens diameter. By using this principle Tamron has been able to shorten the length of the entire optical system and produce lighter, more compact lenses of the same speed, and also to provide greater zoom ranges in lenses that are much more convenient to carry and hand-hold.
XR glass is costlier than conventional glass but it yields enhanced optical power distribution, making the innovative XR lens designs possible.
Ultra Extra Refractive Index
XR glass enhanced
UXR glass is a development of XR glass, bending light even further. Like XR glass, UXR plays an important role in minimising the size and weight of the lens, optimising handling and dexterity.
Stabilises camera blur for sharp images in low light
If you're shooting handheld when light is low, especially with longer lenses, your camera's shutter speeds can extend to a point where the image may turn out blurred due to camera shake. Tamron's VC tracks this shake and neutralises it for sharper images without the inconvenience of a tripod or the artificiality of a flash, in much lower light.
Tamron's unique VC mechanism uses a proprietary actuator and algorithms to deliver an extremely stable viewfinder image with excellent tracking. The tri-axial system uses three driving coils to move internal optical components within the VC lens electromagnetically, based on signals originating from three ball bearings, made from either steel or ceramic. The VC lens elements are held in place only by contact with the balls, achieving smooth movement with minimal friction.
Tamron's original moving magnet system employed a heavy magnet positioned near the moving VC lens element. The improved VC reverses the positions of magnet and coil and attaches the VC optic to the coil. This moving coil is lighter than the magnet, and as this reduces the load on the drive system, both the VC unit and the lens are lighter and more compact.
Smaller, lighter, faster and highly accurate AF
An exclusive Tamron innovation, the Piezo Drive (PZD) is an advanced ultrasonic autofocus (AF) motor based on the latest piezoelectric technology – the standing wave principle. High-frequency voltage turns a ceramic piezoelectric element with a swiveling motion, causing the metal tip at the rotor's contact point to rotate elliptically, thereby turning the rotor to focus the lens swiftly, silently, and with great precision.
Standing wave ultrasonic motors like the one used in Tamron's innovative PZD have a number of advantages. They're smaller and lighter and also provide faster and quieter operation than DC motors for improved AF performance. Compared with their predecessors, their actuator system allows far greater flexibility in lens design, reducing the overall size and weight of the lens.
PZD autofocus is noticeably faster and quieter. Capture crisp images spontaneously, even in noise-sensitive situations. There is enhanced support for contrast-detection AF capabilities, and focusing when in live-view mode is smoother.
Full-time manual focus
Make fine focus adjustments at any time without having to switch out of autofocus mode.
Moisture-resistant construction helps prevent moisture from penetrating the lens.
Minimum focus distance of 39cm over the zoom range, with macro capability to 1:2.9
Designed exclusively for APS-C sized digital SLR cameras, this all-in-one zoom has a minimum focal distance of 0.39m (15.3 in.) through the entire zoom range. Macro capability down to 1:2.9 allows you to enjoy high-quality macro photography with astonishing convenience.
Elegant new design
The rubber grips on the zoom and focus rings have a rectilinear grid pattern that adds sophistication to the design, while the signature Tamron brand ring in tungsten silver enhances its luxurious finish.
- The Sony mount is not equipped with the VC image stabilisation mechanism, as the body of Sony's digital SLR cameras has a built-in image stabilisation function. Consequently, the lens with a Sony mount is referred to as the 18-270mm F/3.5-6.3 Di II PZD and does not include the VC description.
- PZD (Piezo Drive) is a standing wave ultrasonic motor system developed by Tamron. The motor is faster and quieter than DC motors when the AF drive is operated, and compared with arc-type ultrasonic motors, it has an actuator that facilitates lens design and reduced size.
|Focal length||16-300mm (full-frame equivalent 24.8-465mm)|
|Angles of view||Diagonal: 82°12' - 5°20'|
|Lens construction||16 elements in 12 groups|
|Minimum focus distance||0.39m (15.3 in.)|
|Maximum magnification ratio||1:2.9 (at f=300mm and MFD 0.39m)|
|Length from lens mount1,2||99.5mm (3.9 in.)|
|Maximum diameter||75mm (2.9 in.)|
|Diaphragm blades3||7 (circular diaphragm)|
|Minimum aperture||f/22 (16mm) to f/40 (300mm)|
|Standard accessory||Flower-shaped Lens Hood|
|Mounts available||Nikon, Canon, Sony4|